docs: def list_append(self, key, value, create=False, **kwargs):
          """
          Add an item to the end of a list.
  
          :param str key: The document ID of the list
          :param value: The value to append
          :param create: Whether the list should be created if it does not
                 exist. Note that this option only works on servers >= 4.6
          :param kwargs: Additional arguments to :meth:`mutate_in`
          :return: :class:`~.OperationResult`.
          :raise: :cb_exc:`NotFoundError` if the document does not exist.
              and `create` was not specified.
  
          example::
  
              cb.list_append('a_list', 'hello')
              cb.list_append('a_list', 'world')
  
          .. seealso:: :meth:`map_add`
          """
          op = SD.array_append('', value)
          sdres = self.mutate_in(key, op, **kwargs)
          return self._wrap_dsop(sdres)